1 A: What did you do on your holiday?
B: We went to the disco most nights.
2 A: How is the holiday going?
B: Great! We have been to the disco most nights.
3 A: Did you carry on working at the shop after your argument with the manager?
B: No, I left.
4 A: Are you still working at the shop?
B: No, I have left.
5 A: Why are the police here?
B: There has been an accident.
6 A: Why did the metro stop running yesterday evening?
B: There was an accident.
7 A: How are the unemployment figures this year?
B: They have risen by 2%.
8 A: How were the unemployment figures last year?
B: They rose by 2%.